Hand power-driven band-saw



C. A DE CEW ANDW. F. HIRST.

HANDPowEH DRIVEN BANDl SAW.

APPLICATION FILED IAN. 6, 1920.

Patented Apr. 12

gurl/Amm@ FIG. 7.

FIG.. 4.

FIG. 6.

UNITED sT'ArEsPATENT oFFlcE.

omnes A. n n cnw AND WILLIAM' Fr.v maar, or enum RAPIDS, IOWA.

HAND POWER-Daim BAND-saw.

To all lwhom t may vcof/wem.' g Be it known'that we, CHARLES A. DE Cnw 4and WILLIAM F. Hins'r, citizens vof the United States of America residing at Cedar Rapids, in the county of liinn and State of Iowa, have invented certain new and useful Improvements in Hand Power-Driven Band-Saws, of which the following is a specification.

` The principal object ofthe 'present 1n-y vention is to provide a practical hand or manually guided power-driven band saw for carpenters, carriage workers, cabinet makers and butchers.

ln carrying out the above ob]ect, we preferably construct the saw of' a main frame, preferably substantially elliptical in form and composed of channel bar with pulleys at each end of the frame around which the band passes, one of the pulleys being provided with means to cause rotation thereof at various speeds as desired.

@ther objects will become apparent as the nature of the invention is better understood which consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown-in the accompanying4 drawings and claimed.

ln the drawings,

Figure 1 is a side elevational view of a saw constructed in accordance with the present invention,

Fig. 2 is a sectional view thereof taken substantially upon line H-H of Fig. 1 and enlarged,

Fig. 3 isa sectional fragmentary enlarged view taken substantially upon line lll-IH of Fig. 2 and showing the driving arrangement for obtaining different speeds,-

Fig. 4 is a view, partly in top plan and partly in transverse section and showing the grooved driven pulley and the guard for the driving gears, 0

Fig. 5 is a view somewhat similar to Fig. 4 taken on line V-V of Fig. 2 and enlarged,

Fig. 6 is a view partly in top plan and partly broken away and illustrating on an enlargedl scale adjustable connection between the two parts of the main frame to provide for the use of various sized saw bands,

Fig. 7 is a fragmentary plan view illustrating one of the guiding means for varying the angle of the cut relative to the plane of the saw frame,

Fig. 8 is a perspective view of a modified form of saw guide,

Speeicationiof Letters lvatent.`V Patente-d Apr, 12 1921 Aspiration mea January e, i920.` serial No. 349,750. 1

Fig. isl a perspective view of theguide shown 1n Fig. and i Fig. 10 illustrates an attachment shown in perspective and partly broken away,l which may be attached to the present saw for guiding the same at any angle relative' vide a shield for the saw band 6 to travel in.

One side of the frame is cut away so as to expose the saw for cutting as clearly shown in Fig. 1. A handle 7 is rigidly'ixed at one end of the frame to enable an operator to hold and uide the saw.

A cross ead 8 is cast integral with or securely fixed to the frame near the handle end thereof and another cross head 9 is detachably fastened as by screws A10 to the opposite side of the frame, the two cross heads 8 and 9 being provided with central mating bearings 11 in which the stub shaft or axle 12 of the rear -driven pulley 13 is rotatably mounted. The grooved band wheel or pulley 13 carries a' series of concentric ring gears 14 at one side,.each adapted to be selectively meshed with one of the series of pinions 15 which are slidably keyed to an upright shaft 16 so as to longitudinally slide on the latter.

The. cross head 8 is provided with two bearings in which the shaft 16 is journaled, and a flexible shaft 17 is secure-d to the upper end of the shaft 16 and may extend to any suitable source of power such as the armature shaft of an electric motor so as to be driven by the latter. 1- -f The casing 18 incloses the gears 15 and is pivotally mounted as at 19 to swing downwardly for exposing said gears 15, the shield 18 being retained in its upward position as shown in Fig. 1 by any suitable means such as latches 20. A series of slotted transversely disposed walls or plates 21 are rigidly fastened in proper spaced relation within the shield 18 so as to extend inwardly and partially surround the shaft 16 above and below the gears 15. By this arrangement any gear desired may be held between a pair of plates 21 so as to mesh with one of the ring gears 14 while the other two gears 15 are held between pairs of the plates 21 out of mesh with the other two ring gears 14. This changing of the gears 15 may be y:is

vreadily effected by unlatching the shield 18 and swinging the same` outwardly soy that the operator has access to the gears 15 for sliding the latter along the shaft 16v to the Vproperdesired position. Obviously, a dif erent speed is obtained by driving the outermost ring gear 14 than is obtained by driving, the intermediate ring gear or the smallest ring gear. In order to 1nsuremc tion being transmitted to the saw band 6, a vsuitable frictional surface 22 is provided thereon at the base or bottom of the groove thereof. This frictional material mayalso L be provided in the other groove pulley 23y provided at the opposite end of the frame.

The free ends ofthe main frame 5 that are formed -by cutting said frame away as hereinbefore noted, each carries a suitable ide 24 so constructed and positioned as to direct the cutting edge of the band 6 in the desired direction. Obviously, ifit were not for these guides, the cutting edge of the band 6 would be disposed at right angles to the plane of the saw and it is often desirable to have the same twisted. as far as shown wherein the band 6 has its side lin 1 faces isposed ih the plane of the saw. The

guides 24 may consist .in a block of metal sha ed asshown in Fig. 9 and slottedas at 25 orthe passage of the saw` therethrough and may be secured in the ends of the frame 5 bycany suitable means such as a set sc rew v 26. As shown in Figs. 7 and 9, the guides jnector 28 within which the ends of the saw frame are fastened by suitable means such as set screws 29.

i 30 may be I f upon the pivot 32 at any desire As shown Iin Fig. 10, a channel member rovided for attachment to' the frame 5 in rontlof the ulley 13 and rearwardly of the rear gui e 24, said channel member 30 having a cross bar 31 pivoted as at 32-thereto and provided with'end members 33 adapted to engage the straight edge of a board or the like. When the channel member has been vfastened to the frame by the set screws 34, the sawA may be swung angle relative to the longitudinal axis of the member 31 and then saw will thus be guided to makethe desired angular cut.

rEhe forward pulley 23 is suitably journaled upon a shaft 35 which is fastened in a yframe 36 slidably mounted in the frame A5 so. as to move a limited distance forwardly or rearwardly relative to the latter. A set screw 37 is threaded through the baill 38 of the frame 36 and bears upon the frame 5 so .that forward movement of said frame 36 will ensue upon screwing of the set screw 37 inwardly so as to cause tightening of the band 6. V

From the foregoing description, it is be, lleved that the construction and operation Aas well as theadvantages of the present in-l vention will be readily understood by those skilled in the art.

lWhile the form of the invention herein shown and described is what is believed to be the preferable embodiment thereof, it is nevertheless to be understood that minor changes ma be 'made without departing from the spirit and scope of the invention as claimed.

What is claimed as newis:

1. A hand guided power-driven band saw comprising an elongated frame having pulleys rotatably mounted at-the opposite ends .l

thereof, an endle saw band passing around said pulleys, a driven shaft rotatably mounted radially of and adjacent to one side of one of said pulle s, a plurality of pinions slidably mounte for lon 4'tudinal movement upon said shaft, a p uralit of ring gears carried by said side of sai one puley, and means to retain any desired one of said pinions in mesh with one ofsaid ring -gears land to retain the remaining pinions out of mesh with the remaining ring gears.

2. A hand guided power-drivenband saw comprising an elongated frame having pulleys rotatably mounted at the opposite ends thereof, an endless saw band passing around said pulleys, a driven shaft rotatably mounted radially y of and adjacent to one side of one of said pulle s a lurality of pinions slidably Kmounte for ibngitudinal movement upon said shaft, a plurality of rin gears carried by said side of said one.

pul ey, means to retain any desired one of said pinions in mesh with one of said ring gears and to retain the remaining pinions out of mesh with the remaining ring gears, said last named means comprising a gear shield movable to an open osition and having inwardly extendin s otted lates'and arranged at opposite sides of said pinions.

In testimonyv whereof we aiix our signatures.

CHARLES A. DE GEW. WILLIAM F. HIRST. 

